I think trust Tank need to stop doing Berserk and use Defender more because that's how they die in the first place. They can probably add some Damage taken - % for trust along with the boost to accuracy and attack so they don't get killed easily. To make a trust be more helpful is by allowing them to equip a full relic 119 or Empyrean 119 armor set when they are summon using item level 119 weapon and 119 armor.